import { asyncRoutes, constantRoutes } from '@/router'

/**
 * Use meta.role to determine if the current user has permission
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
    if (route.meta && route.meta.roles) {
        return roles.some(role => route.meta.roles.includes(role))
    } else {
        return true
    }
}

/**
 * Filter asynchronous routing tables by recursion
 * @param routes asyncRoutes
 * @param roles
 */
export function filterAsyncRoutes(routes, roles) {
    const res = []

    routes.forEach(route => {
        const tmp = {...route }
        if (hasPermission(roles, tmp)) {
            if (tmp.children) {
                tmp.children = filterAsyncRoutes(tmp.children, roles)
            }
            res.push(tmp)
        }
    })

    return res
}

const state = {
    routes: [],
    addRoutes: []
}

const mutations = {
    SET_ROUTES: (state, routes) => {
        state.addRoutes = routes
        state.routes = constantRoutes.concat(routes)
    }
}

const actions = {
    // 过滤
    generateRoutes({ commit }, roles) {
        return new Promise(resolve => {
            let accessedRoutes
                // 是否包含 edmin
            if (roles.includes('admin')) {
                // accessedRoutes = asyncRoutes || [] // 直接将 异步路由赋值给了 accessedRoutes
                // 新建数组
                var arr = []
                    // 进行异步数组的过滤
                asyncRoutes.forEach(item => {
                    // 判断 asyncRoutes的每个对象中是否包含 meta 属性
                    if (item.hasOwnProperty('meta')) {
                        // 判断对象中的 meta 对象中是否包含 roles 属性
                        if (item.meta.hasOwnProperty('roles')) {
                            // 判断 meta对象中的 roles 数组中是否包含 admin 属性
                            if (item.meta.roles.includes('admin')) {
                                // 将含有 admin 角色的路由加入新数组
                                arr.push(item);
                            }
                        }
                    }
                })
                console.log(asyncRoutes);
                accessedRoutes = arr || []
            } else {
                accessedRoutes = filterAsyncRoutes(asyncRoutes, roles)
            }
            commit('SET_ROUTES', accessedRoutes)
            resolve(accessedRoutes)
        })
    }
}

export default {
    namespaced: true,
    state,
    mutations,
    actions
}